01 - Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper or grease generously.
02 - In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate bowl, combine the melted butter, eggs, orange juice, orange zest, and vanilla extract. Whisk until smooth and well blended.
04 - Pour the wet mixture into the dry ingredients. Stir gently with a spatula until just combined. Do not overmix to keep the bread tender.
05 - Gently fold the chopped cranberries and nuts (if using) into the batter with a few light strokes.
06 - Pour the batter into the prepared loaf pan and smooth the top with a spatula for an even surface.
07 - Bake on the center rack for 50 to 55 minutes, or until a toothpick inserted into the center comes out clean.
08 - Remove from the oven and let the bread cool in the pan for 10 minutes. Transfer to a wire rack and cool completely before slicing.